http://science.hq.nasa.gov/kids/imagers/ems/ems.html

Once you have investigated your assigned section of the spectrum,
create a discussion post from the menu above that tells us:

1. What natural radiation occurs in this part of the spectrum?

2. What kind of messages are typically sent in this part of the spectrum?

3. What is the transmitter of the signal?

4. What is the receiver of the signal?